How can i do a matrix like this one?

I was asked to type these matrices as they appear, but I don't know how to do that. (I highlighted the problem in red) I tried so far this:

$A= \begin{pmatrix} -4 & 2 & 12 \\ 2 & -6 & 9 \\ 8 & 7 & -2 \end{pmatrix}$ \hspace{1.1cm} $A= \begin{pmatrix} 13 & -21 & 9 & 12\\ -9 & 2 & -8 & -7 \\ 9 & -2 & 1 & 7 \end{pmatrix}$ \hspace{1.5cm} $A= \begin{pmatrix} 12 & 11 \\ 11 & 22 \\ 8 & 12 \end{pmatrix}$\\
$A= \begin{pmatrix} 12 & 12 & -2 \\ 2 & 6 & -9 \\ \end{pmatrix}$ \hspace{1.3cm} $A= \begin{pmatrix} -3 & 2 & 8 & 7\\ -4 & 2 & 8 & -7 \\ 2 & -12 & 11 & 32 \\ 1 & 5 & -21 & -12 \\ 12 & -11 & 6 & 76 \\ 11 & 12 & -11 & -29 \\ \end{pmatrix}$ \hspace{1.1cm} $A= \begin{pmatrix} 12 & 7 & 2 & 12 \\ 7 & -4 & 2 & -6 \\ 7 & -9 & 12 & -8 \end{pmatrix}$\\
$A= \begin{pmatrix} 11 & 9 & 13 \\ 12 & -2 & 21 \\ \end{pmatrix}$ \hspace{7.3cm}  $A= \begin{pmatrix} -12 & 21 & -34 & -23 \\ 13 & -21 & 15 & 21 \\ -43 & 16 & 32 & -19 \end{pmatrix}$

And this was where I get. The problem is that I have to type the code exactly as the image, but I don't see how to get that big matrix with that respective spaces.

• You have to add some code, the so-called MWE, and explain your problem clearly if you expect us to help you. How many matrices do you have? How doyou wnt them aligned? etc. Oct 2 '20 at 13:32
• Welcome to TEX.SE! What have you tried so far? What exactly is the problem? The mutual alignment? Please explain. Oct 2 '20 at 13:32

It's quite hard to understand what meaning the required alignment would carry.

A three column array with nested one column arrays should do.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\begin{array}{@{}l@{\hspace{1cm}}ll@{}} \begin{array}[t]{@{}l@{}} A= \begin{pmatrix} -4 & 2 & 12 \\ 2 & -6 & 9 \\ 8 & 7 & -2 \end{pmatrix} \\ A= \begin{pmatrix} 12 & 12 & -2 \\ 2 & 6 & -9 \\ \end{pmatrix} \\[6ex] A= \begin{pmatrix} 11 & 9 & 13 \\ 12 & -2 & 21 \\ \end{pmatrix} \end{array} & \begin{array}[t]{@{}l@{}} A= \begin{pmatrix} 13 & -21 & 9 & 12\\ -9 & 2 & -8 & -7 \\ 9 & -2 & 1 & 7 \end{pmatrix} \\[6ex] A= \begin{pmatrix} -3 & 2 & 8 & 7\\ -4 & 2 & 8 & -7 \\ 2 & -12 & 11 & 32 \\ 1 & 5 & -21 & -12 \\ 12 & -11 & 6 & 76 \\ 11 & 12 & -11 & -29 \\ \end{pmatrix} \end{array} & \begin{array}[t]{@{}l@{}} \\[-2.5ex] A= \begin{pmatrix} 12 & 11 \\ 11 & 22 \\ 8 & 12 \end{pmatrix} \\[6ex] A= \begin{pmatrix} 12 & 7 & 2 & 12 \\ 7 & -4 & 2 & -6 \\ 7 & -9 & 12 & -8 \end{pmatrix} \\[4.5ex] A= \begin{pmatrix} -12 & 21 & -34 & -23 \\ 13 & -21 & 15 & 21 \\ -43 & 16 & 32 & -19 \end{pmatrix} \end{array} \end{array}$

\end{document} 